Ultra-Fine Heterogeneous Microstructure Enables High Strength-Ductility in a Cold-Rolled Medium Mn Steel

作     者：Baojia Hu Chengwu Zheng Qinyuan Zheng Peng Liu Chunni Jia Dianzhong Li Baojia Hu;Chengwu Zheng;Qinyuan Zheng;Peng Liu;Chunni Jia;Dianzhong Li

作者机构：Shenyang National Laboratory for Materials ScienceInstitute of Metal ResearchChinese Academy of SciencesShenyang110016China School of Materials Science and EngineeringUniversity of Science and Technology of ChinaShenyang110016China 

出 版 物：《Acta Metallurgica Sinica(English Letters)》 (金属学报（英文版）)

年 卷 期：2022年第35卷第10期

页      面：1712-1718页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52071322 and 51771192) 

主　　题：Cold-rolled medium Mn steel Heterogeneous structure Yield point elongation Austenite stability Mechanical properties 

摘      要：The objective of the present study is to develop heterogeneous microstructure in cold-rolled medium Mn steels(MMSs)annealing *** cold-rolled Fe-4.7Mn-0.15C(wt%)steel is annealed twice at different temperatures to produce an ultra-fine heterogeneous microstructure with lath-shaped and granular-shaped retained *** mechanical behavior of significant strength enhancement with negligible ductility loss can be *** high strength-ductility properties are attributed to the active transformation induced plasticity effect over a broad strain range owing to dispersive mechanical stabilities of the heterogeneous ***,the typical yield point elongation phenomenon which is commonly observed in cold-rolled MMSs can be effectively reduced by this microstructural strategy.